MDEV-22708 Assertion `!mysql_bin_log.is_open() || thd.is_current_stmt_binlog_format_row()' failed in Delayed_insert::handle_inserts and in Diagnostics_area::set_eof_status

Variable wsrep_forced_binlog_format has higher priority than
binlog_format. In situation where STATEMENT is used and DELAYED INSERT
is executing we should fall back to non-delay INSERT.
Reviewed-by: Jan Lindström <jan.lindstrom@mariadb.com>